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The NCK adaptor protein binds to a proline rich region on WASP and N-WASP through its SH3 domains and has been implicated in the recruitment of WASP/N-WASP to sites of tyrosine phosphorylation. NCK stimulates actin nucleation by N WASP:Arp2/3 complexes. Recruitment of NCK to phosphorylated YDxV sites on nephrin could therefore directly control the cytoskeletal actin architecture of podocytes.